Hi mum, when do you stop giving formula milk to your lo? Is it necessary to give milk until stage 4?

I am still giving formula milk to my 5 years old. I tried to switch to cow's milk when she was 4 years old but she didn't like the taste. I wanted to switch her because formula is sweeter and hence, little ones might prefer that. I stopped insisting she must drink cow's milk so long she gets the nutrition she needs to grow. As this is the peak growing stage, getting enough calcium is important.